Abstract: An image reading apparatus includes a light emitter to irradiate a document with light, a first light guide to guide the light reflected by the document, an output device to output a readout signal obtained from the light reflected and guided by the first light guide, a base to correct shading in the readout signal, and circuitry to output a scanned image in which the shading of the document in the readout signal is corrected, based on correction data obtained from the readout signal of the base output from the output device, control a timing at which the light emitter emits the light and a timing at which the output device outputs a signal, and heat the first light guide with the light emitted from the light emitter before the output device outputs the readout signal of each of the document and the base.

Abstract: An image reading apparatus includes a light emitter to irradiate a document with light, a first light guide to guide the light reflected by the document, an output device to output a readout signal obtained from the light reflected and guided by the first light guide, a base to correct shading in the readout signal, and circuitry to output a scanned image in which the shading of the document in the readout signal is corrected, based on correction data obtained from the readout signal of the base output from the output device, control a timing at which the light emitter emits the light and a timing at which the output device outputs a signal, and heat the first light guide with the light emitted from the light emitter before the output device outputs the readout signal of each of the document and the base.

Abstract: An image processing circuit board, a reading device, an image forming apparatus, an image processing method, and an image processing device. The image processing circuit board subtracts output of an image sensor when no input light is received, from output of a reading device that reads image data of a subject using the image sensor, discriminates between effective area and invalid area of the image data output by the reading device, and converts the image data of the invalid area into a predetermined output value after the output of the image sensor when no input light is received is subtracted from the output of the reading device.

Abstract: An image processing circuit board, a reading device, an image forming apparatus, an image processing method, and an image processing device. The image processing circuit board subtracts output of an image sensor when no input light is received, from output of a reading device that reads image data of a subject using the image sensor, discriminates between effective area and invalid area of the image data output by the reading device, and converts the image data of the invalid area into a predetermined output value after the output of the image sensor when no input light is received is subtracted from the output of the reading device.

Abstract: An image scanner includes: an image sensor that photo-electrically converts reflected light from a document irradiated with light by a light source; an A/D converter that converts an analog image signal output from the image sensor into a digital signal; a lighting control unit that adjusts, in a period other than a document scanning period, a lighting period of the light source so that the light source is turned on and off alternately in a repetitive manner in units of a line cycle; a black correction unit that generates reference black data used for black correction based on effective pixel data in a light source non-lighting period in the period other than the document scanning period; and a white correction unit that generates shading data used for shading correction based on effective pixel data in a light source lighting period in the period other than the document scanning period.

Abstract: Disclosed is an image reader including a first reading unit that reads an image on a front surface of an object placed on a first background member to output a first output value; a second reading unit that reads an image on a back surface of the object placed on a second background member which is different from the first background member to output a second output value; a ground output detecting unit that detects first and second ground output values based on the first and second output values, respectively; a thickness calculating unit that calculates the thickness of the object based on an output ratio between the first ground output value and the second ground output value; and an output correction unit that corrects the first and second output values based on the calculated thickness of the object.

Abstract: An image scanner includes: an image sensor that photo-electrically converts reflected light from a document irradiated with light by a light source; an A/D converter that converts an analog image signal output from the image sensor into a digital signal; a lighting control unit that adjusts, in a period other than a document scanning period, a lighting period of the light source so that the light source is turned on and off alternately in a repetitive manner in units of a line cycle; a black correction unit that generates reference black data used for black correction based on effective pixel data in a light source non-lighting period in the period other than the document scanning period; and a white correction unit that generates shading data used for shading correction based on effective pixel data in a light source lighting period in the period other than the document scanning period.

Abstract: Disclosed is an image reader including a first reading unit that reads an image on a front surface of an object placed on a first background member to output a first output value; a second reading unit that reads an image on a back surface of the object placed on a second background member which is different from the first background member to output a second output value; a ground output detecting unit that detects first and second ground output values based on the first and second output values, respectively; a thickness calculating unit that calculates the thickness of the object based on an output ratio between the first ground output value and the second ground output value; and an output correction unit that corrects the first and second output values based on the calculated thickness of the object.

Abstract: In a noise canceling method and an apparatus therefor which notices the colored noise looked macroscopically, positively cancels the dominant noise component in the low frequency band, shifts the S/N value to plus, and can extract the reception signal buried in the low frequency band and having a comparatively high level, a signal in which a time axis, an amplitude, and a phase are specified or a zero-point signal is inserted into a transmission signal by an inserter, a noise component is interpolated by using the specified signal or the zero-point signal by a noise canceler, and an originally transmitted signal is regenerated by subtracting the noise component from the reception signal.

Abstract: The present invention provides a delivery management system including a public key storage unit for storing a public key of the addressee; a secret key input unit for inputting a secret key of the addressee; and an authentication unit for authenticating the addressee on the basis of the secret key inputted by the secret key input unit and the public key stored in the public key storage unit. Thereby, it is possible to grasp that the addressee receives the delivery so as to improve a reliability of the deliver.

Abstract: In a noise canceling method and an apparatus therefor which notices the colored noise looked macroscopically, positively cancels the dominant noise component in the low frequency band, shifts the S/N value to plus, and can extract the reception signal buried in the low frequency band and having a comparatively high level, a signal in which a time axis, an amplitude, and a phase are specified or a zero-point signal is inserted into a transmission signal by an inserter, a noise component is interpolated by using the specified signal or the zero-point signal by a noise canceler, and an originally transmitted signal is regenerated by subtracting the noise component from the reception signal.

Abstract: In a synchronization method and apparatus in a data transmission using a transparent transmission line, a periodic amplitude modulation is applied, or a zero-point is inserted, as a synchronizing signal to a transmission signal point on a transmission side at a preceding stage of a transparent transmission line. Also, in case of a frame synchronization, a power value of a received signal is calculated on a reception side of the above-mentioned transparent transmission line and the synchronizing signal is vectorized using the power values whose phases are different from each other by 90 degrees on a time axis.

Abstract: In a synchronization method and apparatus in a data transmission using a transparent transmission line, a periodic amplitude modulation is applied, or a zero-point is inserted, as a synchronizing signal to a transmission signal point on a transmission side at a preceding stage of a transparent transmission line. Also, in case of a frame synchronization, a power value of a received signal is calculated on a reception side of the above-mentioned transparent transmission line and the synchronizing signal is vectorized using the power values whose phases are different from each other by 90 degrees on a time axis.

Abstract: The n-bit data is converted to specific patterns of n+m-bit data when the data is written to the memory device. These specific patterns are those n+m-bit data patterns that have the more numbers of logic values that have the smaller amount of current consumed. Additionally, when the n+m-bit data is read, it is converted back to the original n-bit data. This process makes it possible to reduce the number of write/read operations for the logic values that consume the greater amount of electric current when writing/reading the data to/from the memory device, thereby reducing the amount of power consumed.

Abstract: In a noise canceling method and an apparatus therefor which notices the colored noise looked macroscopically, positively cancels the dominant noise component in the low frequency band, shifts the S/N value to plus, and can extract the reception signal buried in the low frequency band and having a comparatively high level, a signal in which a time axis, an amplitude, and a phase are specified or a zero-point signal is inserted into a transmission signal by an inserter, a noise component is interpolated by using the specified signal or the zero-point signal by a noise canceler, and an originally transmitted signal is regenerated by subtracting the noise component from the reception signal.